ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.

Question

A missile is fired from a jet flying horizontally at Mach 2 (2200 ft/s). The missile has a horizontal acceleration of 1000 ft/s2. Calculate its horizontal velocity at 10.0 seconds after it is fired. (Assume constant acceleration of the missile throughout its flight.)
12,200 ft/s
10,000 ft/s
2300 ft/s
7800 ft/s
my answer is 2300 ft/s

Answer 1

V = Vo + a*t = 2200 + 1000*10 = 12,200 ft/s.